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/*
* Code extracted from
* linux/kernel/hd.c
*
* Copyright (C) 1991-1998 Linus Torvalds
*
* devfs support - jj, rgooch, 980122
*
* Moved partition checking code to fs/partitions* - Russell King
* (linux@arm.uk.linux.org)
*/
/*
* TODO: rip out the remaining init crap from this file --hch
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/genhd.h>
#include <linux/kernel.h>
#include <linux/blk.h>
#include <linux/init.h>
#include <linux/spinlock.h>
static rwlock_t gendisk_lock;
/*
* Global kernel list of partitioning information.
*
* XXX: you should _never_ access this directly.
* the only reason this is exported is source compatiblity.
*/
/*static*/ struct gendisk *gendisk_head;
static struct gendisk *gendisk_array[MAX_BLKDEV];
EXPORT_SYMBOL(gendisk_head);
/**
* add_gendisk - add partitioning information to kernel list
* @gp: per-device partitioning information
*
* This function registers the partitioning information in @gp
* with the kernel.
*/
void
add_gendisk(struct gendisk *gp)
{
struct gendisk *sgp;
write_lock(&gendisk_lock);
/*
* In 2.5 this will go away. Fix the drivers who rely on
* old behaviour.
*/
for (sgp = gendisk_head; sgp; sgp = sgp->next)
{
if (sgp == gp)
{
// printk(KERN_ERR "add_gendisk: device major %d is buggy and added a live gendisk!\n",
// sgp->major)
goto out;
}
}
gendisk_array[gp->major] = gp;
gp->next = gendisk_head;
gendisk_head = gp;
out:
write_unlock(&gendisk_lock);
}
EXPORT_SYMBOL(add_gendisk);
/**
* del_gendisk - remove partitioning information from kernel list
* @gp: per-device partitioning information
*
* This function unregisters the partitioning information in @gp
* with the kernel.
*/
void
del_gendisk(struct gendisk *gp)
{
struct gendisk **gpp;
write_lock(&gendisk_lock);
gendisk_array[gp->major] = NULL;
for (gpp = &gendisk_head; *gpp; gpp = &((*gpp)->next))
if (*gpp == gp)
break;
if (*gpp)
*gpp = (*gpp)->next;
write_unlock(&gendisk_lock);
}
EXPORT_SYMBOL(del_gendisk);
/**
* get_gendisk - get partitioning information for a given device
* @dev: device to get partitioning information for
*
* This function gets the structure containing partitioning
* information for the given device @dev.
*/
struct gendisk *
get_gendisk(kdev_t dev)
{
struct gendisk *gp = NULL;
int maj = MAJOR(dev);
read_lock(&gendisk_lock);
if ((gp = gendisk_array[maj]))
goto out;
/* This is needed for early 2.4 source compatiblity. --hch */
for (gp = gendisk_head; gp; gp = gp->next)
if (gp->major == maj)
break;
out:
read_unlock(&gendisk_lock);
return gp;
}
EXPORT_SYMBOL(get_gendisk);
#ifdef CONFIG_PROC_FS
int
get_partition_list(char *page, char **start, off_t offset, int count)
{
struct gendisk *gp;
char buf[64];
int len, n;
len = sprintf(page, "major minor #blocks name\n\n");
read_lock(&gendisk_lock);
for (gp = gendisk_head; gp; gp = gp->next) {
for (n = 0; n < (gp->nr_real << gp->minor_shift); n++) {
if (gp->part[n].nr_sects == 0)
continue;
len += snprintf(page + len, 63,
"%4d %4d %10d %s\n",
gp->major, n, gp->sizes[n],
disk_name(gp, n, buf));
if (len < offset)
offset -= len, len = 0;
else if (len >= offset + count)
goto out;
}
}
out:
read_unlock(&gendisk_lock);
*start = page + offset;
len -= offset;
if (len < 0)
len = 0;
return len > count ? count : len;
}
#endif
extern int blk_dev_init(void);
#ifdef CONFIG_FUSION_BOOT
extern int fusion_init(void);
#endif
extern int net_dev_init(void);
extern void console_map_init(void);
extern int soc_probe(void);
extern int atmdev_init(void);
extern int i2o_init(void);
extern int cpqarray_init(void);
int __init device_init(void)
{
rwlock_init(&gendisk_lock);
blk_dev_init();
sti();
#ifdef CONFIG_I2O
i2o_init();
#endif
#ifdef CONFIG_FUSION_BOOT
fusion_init();
#endif
#ifdef CONFIG_FC4_SOC
/* This has to be done before scsi_dev_init */
soc_probe();
#endif
#ifdef CONFIG_BLK_CPQ_DA
cpqarray_init();
#endif
#ifdef CONFIG_NET
net_dev_init();
#endif
#ifdef CONFIG_ATM
(void) atmdev_init();
#endif
#ifdef CONFIG_VT
console_map_init();
#endif
return 0;
}
__initcall(device_init);
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